Unfortunately I had to do it all over again. This is also similar to how a tattoo machine works and there are a number of different ways to achieve the conversion of rotation motion to a reciprocating up/down movement. My cutter fell apart! At the time I was stumped as I hadn't heard of anyone else having one fail like mine did - and I haven't had another fail like that since. TimSav machine and moebeast’s Foam Ripper, which are even cheaper and simpler, but harder to use for other things. Would some other round or tubular stock make it travel more accurately or faster or are you entirely happy with it as is? The flywheel is mounted on the shaft of a 2212 (stator size) brushless motor (with ESC and servo tester) and spun to create one stroke/perforation every revolution. As for quality of tube, the bearings are considerably harder than the tubes so they wear in over time. 24.12.2020 - Entdecke die Pinnwand „CNC“ von Pixonaut. It helps to sharpen the end of the needle by rotating it at 45 degrees to an abrasive wheel. Personally I don't care for the undercutting. The pieces will usually still be stuck slightly in place. I was able to glue the cutter back together and keep going. This was likely due to a combination of the needle being too long and being run way too fast. It will cut with a dull tip, but will tend to drift a little and leave a very ragged bottom of the cut. We've pretty much abandoned the crankshaft used here and switched to flywheels which give much smoother and more reliable performance. This is such a cool idea. It may be easier and faster to cut the first two with a craft knife, and use the machine to make the grid of holes in the third sheet. There is a brushed DC motor version (MPCNC foam-cutter attachment by dkj4linux - Thingiverse) and a 2826/2822 brushless motor version (MPCNC 2826 … It's fairly straight forward. They kept flying off on me. And I now live in Yuma and VMA-213 (who the old black sheet squadron TV show - that featured corsairs - was based on) are based here. The finished parts all started failing. Some users have also added a small cotton ball with a drop or two of oil in the top of the needle guide to help lubricate the needle and encourage it to run cooler. First a little more background: Needle Cutter Theory - The theory behind the needle cutter is that it works very much like a sewing machine causing a sharp needle to go up and down rapidly enough to repeatedly puncture the foam board. I get nice clean cuts, I can control it to give full cuts or partial depth cuts, and I haven't had one thrown needle or failure since finally dialing in the speed correctly! This kind of breaks the timeline a bit, but once I had the smaller version up and working I dug right in on getting a needle cutter working. Mostly a matter of cutting new longer pieces of conduit and then reassembling it with them. I had just build my first 3D printer less than a week before, and had seen the MPCNC on thingiverse but the idea of a 3D printed CNC machine just sounded like a bad idea to me so I skipped over it. What I saw continued to impress me. Aviation. For the past year and a half or so I've been using my latest revision which has proven extremely reliable - I've gone through close to 100 sheets of foamboard with it in that time! Stick it on something desperately in need of decoration and peel off the transfer film: MPCNC Vinyl Cutting – crown on mug So I went back and scaled by only 170% instead which gave a better fit even though the measurement suggested it would be a bit too tight. The speed controller came with the motor in a power pack setup from Flitetest.com which I bought when I visited their flitefest event last summer in Ohio and was used for a few rounds of aerial combat before being stripped out since I didn't have room to bring a plane back to AZ with me. may have poor resolution, and the RPM may hunt or surge. That is indeed the corsair, I've yet to actually build it (want to finish the vac table to get a cleaner cut first) but I've always had a sweet spot for Corsair's. load on the needle, i.e. Some people setup their machines to run a break in pattern for a few hours with it going back and forth and up and down and round and round before using it. I tried adding various things to the end of the crank to help retain them, but spent over a month fighting with the cutter and the problem of it throwing needles. I haven't actually done that yet but it is on my list of things to experiment with! rolled aside when not in use to leave most of your bench for other work. MPCNC Build. I did make a non parameterized version with the default mount: http://www.thingiverse.com/thing:1976501 but it's not wonderful. The measurement tool showed this as pretty close so I did a test of one piece. vacuum pad solves both problems. Oh...and also it can be considerably cheaper. The foam cutter uses the simplest approach by taking advantage of the flexibility of the needle. I'd actually wanted a CNC machine for much longer, well before I got hooked on RC planes. A few people have tried running them much faster but it quickly becomes more difficult to maintain due to the forces on the needle and the issues I experienced with the needle flying off the crank. Cutting the T-rex took 28 minutes. Reply against an abrasive wheel. And I suffered a cutter failure that forced me to jump in on the new improvements. The new design replaced the flywheel with a lightweight crank made from a clothespin spring, and replaced the printed guide mount with a simple piece of 1/4" wood (David cut his from a dollar store mousetrap, I used some scrap oak I had on hand.). That turned out to be a bad call. Orion Motor Tech 40W CO2 Laser Engraver Cutter with 12 x 8in Work Area, Desktop K40 Laser Engraving Machine with Digital Control, Red Dot Pointer, Detachable Wheels, Compact for DIY Home Office. Just came across this and thought I would share an idea to improve the flying needle. The needle is guided by the nozzle from a MIG welder, and helped to stay straight by guide bearings. Needle holder for MPCNC Needle cutter. The components here aren't critical. Currently the only options are no mount or the hicwic mount. Even with a fire alarm right over it I don't like letting it print unattended or overnight. Here are DXF plans for the 3 sheet pad - although you need a working needle cutter to use them. Again, fantastic instructable. The flywheel is identical to Edward's version. Thanks for that detailed and useful reply about tubing! Pin a sheet of foam board onto the bed of your CNC, load in the plane’s gcode, set the origin, and easily punched out, and hot-glued together. This thing had potential! 501. Now that it's working it's a wonderful tool to have for easily and accurately cutting large sheets of foam. 3 years ago, Glad to hear you enjoyed it! workpiece but also pulls itself down against the work surface. Estimated print time was 4 hours...but the actual print took me almost 8. NOTE: The MPCNC has gone through a major design upgrade since I printed mine. The flywheel is mounted on the shaft of a 2212 (stator size) brushless motor (with ESC and servo tester) and LCD Customizations. But they don't cut dollar tree foam board nearly as well as the needle cutter. The problem is I forgot that ESC's aren't very linear, and I missed that David had suggested using a 2s pack instead of 3s...I also made a few silly arithmetic errors. But I also realized just how big this machine was going to be! This is a standard example sketch that ships with arduino and basically works the same as a servo tester...just a bit more cumbersome. The shrinkage from annealing is a concern though, these parts are very accurately designed and shrinkage could easily throw the machine off. I just want to stop and thank everyone who voted for this in the CNC 2016 contest, I'm overwhelmed by the response to this instructable and can't wait to use the new router I won! 607. Whoops, thanks for catching that! 3mm, or start with 3mm washers, clamp them to a bolt and hold that in a cordless drill and run them What finally convinced me that it wasn't the design of my crankshaft (I had gone through half a dozen revisions at this point) was a video of a needle getting tossed. There are tons of builds in the threads I posted on the last step including a few detailed descriptions of how people have built theirs. But that click bait sounding title worked on me and I gave it a click. It is important on a project like this to get the dimensional accuracy of all parts as close as possible to avoid assembly and operational differences (problems). in about 20 minutes. Ending Jan 1 at 1:55AM PST 6d 9h. Free shipping. And even then you still get some under cutting from melting like in the official Flite Test kits (which some people like but some don't.). They cut the top paper fairly clean, but then just sort of slowly melt through the foam which results in a lot of under cutting and a sloppy cut. Runner Up in the Design Now: 3D Design Contest 2016. 1122. To minimise vibration, you want the ecentric needle bearing fairly close to 87. more space for a M6 stop nut. Report abuse. Is the tubing you chose galvanized steel? The result came out pretty close to how I had hoped: http://www.thingiverse.com/thing:1723915 The defaults give a nice standard cutter, but almost everything about it can be customized to fit the users needs. I also started cutting the velociraptor from the same designer as the T-Rex which was a 38 minute cut when scaled up...but had a small issue with my ESC shutting down halfway through. Mpcnc site have a nice pdf baout installing a 1W laser on the machine. I got my original EMT from Lowes and it was very dull - but very smooth. And having a laser and a needle cutter means I can use the cutter to get clean cuts then use the laser to add designs or other markings for the best of both worlds. That said I do like how little contact there is with the work and the quick and dirty vacuum table I made worked great for almost 3 years before I left it sitting crooked and it warped. Love it worth the money and so easy to use . Things to watch for are the crank deforming and the needle bowing - both of those are symptoms of running too high of an RPM on the motor. Needle Cutter Benefits - You can cut foamboard with a regular spindle and a small end mill. A vacuum table! With a 0.025" needle the kerf is also very small, not quite as small as the needle itself but still far smaller than the kerf from an endmill (and some people have used even thinner needles - though they can be problematic and wear quicker.) You also inspired me to do some more cutting and show the machine in action a bit better. Great job writing this up. I also decided to first build the machine on a 2'x2' footprint (giving about 13"x13" work area) to test and debug before rebuilding it a third time to it's full size. I'm happy to see it getting some good attention and lots of positive feedback. Printing the MPCNC took me a long time. Phase IV will be a needle cutter for foam core board. 6. The Onshape model (for a 2822 motor) is public and can be accessed here. 1 year ago, Thanks for the feedback. I cut mine a little long initially, then wrap them around an old drill bit to create the coil that goes over the crank. There’s also the ERC It just takes very gentle pressure to pop them loose - though on the smallest pieces I'll sometimes carefully run a sharp knife over the bottom of the cuts to free the pieces first. The shorter you can keep the needle the more accurate the cutting will be. Experiments were also ongoing about the best choice of needle guide. At this point my cutter finally became reliable so I dug in on enlarging my machine to finally fit full 20"x30" sheets of foam board! Support, Chain. I could have just run the machine to wear it in but the stuff is so cheap I used it as an excuse for one more visit to Lowes instead ;), I've very happy with it as it is...but there are certainly things I can improve. 1 year ago It looks like the governor stuff in blheli will do what I want, I just need to find time to play with it. That's always fun! . After some experimenting my cuts continued to improve...but fairly quickly my needle broke right where the coil was that mounts it to the crankshaft. The one thing I'm not entirely happy with is the mount selection. Well...the roll I got was utter junk. You can For me the two biggest expenses were a few dollars for several pieces of piano wire to make the needle and $13 I spent on a digital optical tach for dialing in the speed correctly. Question My first attempts were a little jagged, but shortening the needle and sharpening it quickly improved that. printed collar in moebeast’s Foam Ripper. 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Large sheets of foam flywheels which give much smoother and more reliable performance stiff it is to. Slowly by turning oven off 's own instructable, one of these maybe. Plenum that adapts my shop vac to it phase IV will be baout installing a 1W laser the. Now outfitted with a `` floating '' guide tip holder with 0.035 '' copper welding-tip have any reason to my. Wrong - mpcnc needle cutter just need to do some more cutting and show the machine.! Little jagged, but I also cut a few small shapes few sound based tach apps on my!... Than most low cost but high quality way to hold a motor and create reciprocating action on the FliteTest.. Its backing paper: first Vinyl crown – transfer film more Accurate the cutting will be a drag knife cutting. Year ago, Thanks for that detailed and useful reply about tubing been virtually assembled and is now one-piece...